Local Earthquake Tomography of the Northern Part of the 27 February 2010 Maule Earthquake with the Extensional Aftershock Cluster of Pichilemu.

Lange, Dietrich, Tilmann, Frederik J., Lieser, Kathrin, Grevemeyer, Ingo , Barrientos, Sergio E. and Diehl, Tobias (2012) Local Earthquake Tomography of the Northern Part of the 27 February 2010 Maule Earthquake with the Extensional Aftershock Cluster of Pichilemu. [Poster] In: AGU Fall Meeting 2012. , 03.-07.12.2012, San Francisco, USA .

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Abstract

On 27 February 2010 the Mw 8.8 Maule earthquake in Central Chile ruptured a well known seismic gap, which last broke in 1835. Shortly after the mainshock Chilean agencies (UC Santiago, UC Concepción) and the international seismological community (USA (IRIS), France (IPGP), UK (University of Liverpool), Germany (GFZ)) installed a total of 142 portable seismic landstations stations along the whole rupture zone in order to capture the aftershock activity. Additionally a network of 30 ocean bottom seismometers was deployed (IFM Geomar) in the northern portion of the rupture area for a three month period between 20 September 2010 and 25 December 2010. We present first results from local earthquake tomography based on arrival times from automatic detection algorithms and picking engines which are calibrated with manually picked events. The Vp and Vp/Vs velocity models will better illuminate the structure of the forearc including the downgoing slab, the sedimentary basins and the volcanic arc down to depths of 75 km. The 2D and 3D velocity models cover the northern part of the rupture Maule 2010 rupture zone between 33 ° and 36 °S. This region is characterized by pronounced crustal aftershock activity which started after a strong aftershock doublet (Mw=6.9) on 11 March 2010 near the city of Pichilemu (~34.5 °S) in the overriding plate. This pronounced cluster of crustal seismicity close to the city of Pichilemu will be the focus area with smaller node spacing of the velocity model.

Document Type: Conference or Workshop Item (Poster)
Additional Information: T43E-2726
Research affiliation: GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Date Deposited: 28 Jan 2013 11:53
Last Modified: 16 Dec 2014 12:02
URI: http://oceanrep.geomar.de/id/eprint/20202

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